Abstract: Various embodiments of a vortex thruster system is described herein that are configured to create at least three discrete thrust levels. In some embodiments, the vortex thruster system includes a catalyst bed configured to decompose a monopropellant at more than one flow rate and deliver the decomposed monopropellant into a vortex combustion chamber for generating various thrust levels. In some embodiments, the catalyst bed includes a screen assembly positioned within the inner chamber of the catalyst bed. The screen assembly can include alternating reactive screens and inert screens. The reactive screens can include a catalytic coating for assisting with decomposing the monopropellant, and the inert screens can provide structural support for the screen assembly. Related systems, methods, and articles of manufacture are also described.